diff --git a/Cargo.lock b/Cargo.lock
index c7a5724..4f7eb32 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -21,6 +27,49 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "crossbeam-channel"
+version = "0.5.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a33c2bf77f2df06183c3aa30d1e96c0695a313d4f9c453cc3762a6db39f99200"
+dependencies = [
+ "cfg-if",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce6fd6f855243022dcecf8702fef0c297d4338e226845fe067f6341ad9fa0cef"
+dependencies = [
+ "cfg-if",
+ "crossbeam-epoch",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.9.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae211234986c545741a7dc064309f67ee1e5ad243d0e48335adc0484d960bcc7"
+dependencies = [
+ "autocfg",
+ "cfg-if",
+ "crossbeam-utils",
+ "memoffset",
+ "scopeguard",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a22b2d63d4d1dc0b7f1b6b2747dd0088008a9be28b6ddf0b1e7d335e3037294"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "either"
 version = "1.9.0"
@@ -53,6 +102,12 @@ dependencies = [
  "rand",
 ]
 
+[[package]]
+name = "hermit-abi"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
+
 [[package]]
 name = "indicatif"
 version = "0.17.6"
@@ -63,6 +118,7 @@ dependencies = [
  "instant",
  "number_prefix",
  "portable-atomic",
+ "rayon",
  "unicode-width",
 ]
 
@@ -96,6 +152,25 @@ version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
+[[package]]
+name = "memoffset"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a634b1c61a95585bd15607c6ab0c4e5b226e695ff2800ba0cdccddf208c406c"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "num_cpus"
+version = "1.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
+dependencies = [
+ "hermit-abi",
+ "libc",
+]
+
 [[package]]
 name = "number_prefix"
 version = "0.4.0"
@@ -144,6 +219,28 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "rayon"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d2df5196e37bcc87abebc0053e20787d73847bb33134a69841207dd0a47f03b"
+dependencies = [
+ "either",
+ "rayon-core",
+]
+
+[[package]]
+name = "rayon-core"
+version = "1.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b8f95bd6966f5c87776639160a66bd8ab9895d9d4ab01ddba9fc60661aebe8d"
+dependencies = [
+ "crossbeam-channel",
+ "crossbeam-deque",
+ "crossbeam-utils",
+ "num_cpus",
+]
+
 [[package]]
 name = "raytracing-in-one-weekend"
 version = "0.1.0"
@@ -152,8 +249,15 @@ dependencies = [
  "indicatif",
  "itertools",
  "rand",
+ "rayon",
 ]
 
+[[package]]
+name = "scopeguard"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
+
 [[package]]
 name = "unicode-width"
 version = "0.1.10"
diff --git a/Cargo.toml b/Cargo.toml
index 640a47b..7aed2bf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,6 +7,7 @@ edition = "2021"
 
 [dependencies]
 glam = { version = "0.24.1", features = ["rand"] }
-indicatif = "0.17.6"
+indicatif = { version = "0.17.6", features = ["rayon"] }
 itertools = "0.11.0"
 rand = "0.8.5"
+rayon = "1.7.0"
diff --git a/src/main.rs b/src/main.rs
index b67136a..4d8db18 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,13 @@
 use glam::DVec3;
+use indicatif::ParallelProgressIterator;
 use indicatif::ProgressIterator;
 use itertools::Itertools;
 use rand::prelude::*;
-use std::{fs, io, ops::Range};
+use rayon::iter::IntoParallelRefIterator;
+use rayon::iter::{IntoParallelIterator, ParallelIterator};
+use rayon::prelude::*;
 
+use std::{fs, io, ops::Range};
 fn main() -> io::Result<()> {
     let mut rng = rand::thread_rng();
 
@@ -111,7 +115,7 @@ fn main() -> io::Result<()> {
         look_at: Some(DVec3::ZERO),
         vup: Some(DVec3::Y),
         focus_dist: Some(10.0),
-        defocus_angle: Some(0.6),
+        defocus_angle: Some(0.0),
     });
     camera.render_to_disk(world)?;
 
@@ -301,10 +305,12 @@ impl Camera {
     }
     fn render_to_disk<T>(&self, world: T) -> io::Result<()>
     where
-        T: Hittable,
+        T: Hittable + std::marker::Sync,
     {
         let pixels = (0..self.image_height)
             .cartesian_product(0..self.image_width)
+            .collect::<Vec<(u32, u32)>>()
+            .into_par_iter()
             .progress_count(
                 self.image_height as u64
                     * self.image_width as u64,
@@ -347,6 +353,7 @@ impl Camera {
                     color.x, color.y, color.z
                 )
             })
+            .collect::<Vec<String>>()
             .join("\n");
         fs::write(
             "output.ppm",
@@ -379,7 +386,7 @@ impl Ray {
     }
     fn color<T>(&self, depth: i32, world: &T) -> DVec3
     where
-        T: Hittable,
+        T: Hittable + std::marker::Sync,
     {
         if depth <= 0 {
             return DVec3::new(0., 0., 0.);
@@ -656,7 +663,7 @@ impl Hittable for Sphere {
 }
 
 struct HittableList {
-    objects: Vec<Box<dyn Hittable>>,
+    objects: Vec<Box<dyn Hittable + Sync>>,
 }
 impl HittableList {
     fn clear(&mut self) {
@@ -665,7 +672,7 @@ impl HittableList {
 
     fn add<T>(&mut self, object: T)
     where
-        T: Hittable + 'static,
+        T: Hittable + 'static + Sync,
     {
         // was push_back
         self.objects.push(Box::new(object));